The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A231251

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

Number of 6Xn 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero
(history; published version)

#4 by R. H. Hardin at Wed Nov 06 05:46:27 EST 2013

STATUS

editing

approved

#3 by R. H. Hardin at Wed Nov 06 05:46:22 EST 2013

LINKS

R. H. Hardin, <a href="/A231251/b231251.txt">Table of n, a(n) for n = 1..210</a>

#2 by R. H. Hardin at Wed Nov 06 05:45:58 EST 2013

NAME

allocated for R. H. Hardin

Number of 6Xn 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

DATA

0, 230, 26658, 968824, 46019438, 2532190370, 138246711032, 7463273437410, 402976497021292, 21783144616290196, 1177676505112866416, 63665644231425324844, 3441753613615266889856, 186061892941455426254038

OFFSET

1,2

COMMENTS

Row 6 of A231246

EXAMPLE

Some solutions for n=2

..0..1....0..3....0..1....0..1....0..3....0..1....0..1....0..1....0..1....0..1

..2..3....0..1....2..3....2..3....0..1....2..1....2..1....2..1....2..1....2..3

..2..1....2..3....0..1....2..1....2..1....0..3....2..3....2..3....0..3....1..0

..0..1....2..1....0..1....3..0....2..3....2..1....0..1....0..3....0..1....3..2

..2..3....0..3....2..3....1..0....0..1....3..0....3..2....2..1....2..3....3..0

..0..1....2..3....2..1....3..2....2..3....1..2....1..0....0..1....2..1....1..2

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin, Nov 06 2013

STATUS

approved

editing

#1 by R. H. Hardin at Wed Nov 06 05:33:49 EST 2013

NAME

allocated for R. H. Hardin

KEYWORD

allocated

STATUS

approved